The Ticker: Tumblr’s growth; News + mobile; CNN vs. MSNBC; Political experience; Bloggers vs. healthcare

Social TimesTumblr Reaches 20 Billion Posts

theguardianMobile and the news media’s imploding business model

PoliticoCNN spins, MSNBC wins first quarter ratings

PR at SunriseThe Benefits of Working on Political Campaigns for Entry-Level PR Pros

The AtlanticDid Bloggers Kill the Health Care Mandate?